Fig. 1. Experimental configuration of the proposed bidirectional carrier aggregation in next-generation radio-over-fiber heterogeneous networks based on FBMC. Insets (i)–(iii) are the optical spectra.

Fig. 2. RIN of FPLD.

Fig. 3. Optical spectra of (a) free running FPLD, (b) two incoherent light injected modes of FPLD, (c) DL three intra-bands CA LTE-A signal, and (d) DL five intra-bands CA MMW FBMC signal.

Fig. 4. Average EVMs of (a) five intra-bands CA DL FBMC signal as a function of received optical power, (b) three intra-bands CA DL LTE-A signal as a function of received optical power, and (c) two intra-bands CA UL WLAN IEEE 802.11g signal as a function of received optical power.

Fig. 5. Electrical spectra of received (a) DL five intra-bands CA FBMC, (b) DL three intra-bands CA LTE-A, and (c) UL two intra-bands CA WLAN IEEE 802.11g signals.